Printing telegraph apparatus



Dec. 5, 1939. H. L. KRUM PRINTING TELEGRAPH APPARATUS Filed May 6, 1937 6 Sheet-Sheet l ATTORNEY.

Dec. 5, 1939. H. K RUM PRINTING TELEGRAPH APPARATUS HINVENTOR. HOWARD 7L. KRUM ATTORNEY.

6 Sheets-Sheet 2 w Filed May 6, 1937 I mm mm Dec. 5, 1939. H. KRUM PRINTING TELEGRAPH APPARATUS Filed May 6, 1937 6 Sheets-Sheet 3 wt mmu INVENTOR. HOWARD L. KRUM ATTORNEY.

, 1939. H. L.'KRUM PRINTING TELEGRAPH APPARATUS Filed May 6', 1957 \6 Sheets-Sheet 4 INVENTOR. HOWARD L. KRUM Dec. 5, 1939. KR M 2,182,634

PRINTING TELEGRAPH APPARATUS Filed May 6, 1937 6 Sheets-Sheet 5 INVENTOR. HOWARD L. KRUM ATTORNEY.

Dec. 5, 1939. H. K-RUM PRINTING TELEGRAPH APPARATUS 6 Sheets-Sheet 6 Filed May 6, 1937 w R O mu m Wm n lw A 0 H N NE F Patented Dec. 5, 1939 UNITED STATES PRINTING TELEGRAPH APPARATUS.

Howard L. Krum, Kenilworth, Ill., assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application May 6, 1937, Serial No. 141,042

28 Claims.

This invention pertains to printing telegraph apparatus and especially to a type wheel printer for recording characters in page form.

The primary object of the invention is to provide a lightweight and readily portable page printer which is reliable and eflicient in operation.

Another object is to provide a type wheel printer in which the chief operating characteristics are analogous to those inherent in certain extensively employed type bar printers, to render the former printers capable of operation in the same telegraph circuits with the latter printers for recording the same message line for line and perform the same functions.

Briefly, the apparatus according to the present invention employs a single magnet permutation code selector, the selections on which are transferred to a series of code bars, which selectively control a plurality of selectable stop levers, which in turn cooperate with a corresponding plurality of stop arms helically arranged around and affixed to a rotatable cylindrical member. Each of the stop arms terminates in two steps or shoulders, so that each arm governs the positionment of two characters on a type wheel. The type wheel consists of a circular disc, having equally spaced radial slots, thus forming a series of radiating reeds, upon which the letters and figures are arranged in a single row. The upper and lower case characters are arranged alternately and mechanism is provided for shifting the type wheel angularly, or rotationally, relative to the axis of the supporting shaft, one-half step, the distance between two successive characters in the same case being considered as one step.

A cylindrical platen is movable to effect character spacing, is rotated for line feeding, and isfurther controlled by character spacing and carriage return mechanisms. Visible printing is attained by withdrawing the type wheel from the platen, after printing, a substantial distance sufficient to preclude obstruction of vision. The usual functions of suppressing spacing and printing during the performance of certain other functions (for example, case shift, carriage return, and line feed) are included.

The keyboard has been designed with a view toward providing a compact organization of parts. To achieve this result the key levers have a concave depression, into the hollow of which is positioned the motor. By permitting the motor to be thus lowered, the height of the apparatus is reduced appreciably.

The functions are performed by levers actuated from cams on the vertically disposed main shaft, after being conditioned for operation by drop bars in the selector mechanism. Ink is supplied to the character faces on the type wheel by means of an inking roller to simplify the construction, but it is, of course, understood that ribbon feed and reversing mechanisms can readily be applied. In connection with the carriage return mechanism, spacing and retaining pawls, when withdrawn from engagement with the spacing rack, are latched into drawn position and remain latched until the carriage return operation is completed and the next character is printed, whereupon they are unlatched and are permitted to again engage the spacing rack, thus insuring a uniform margin for printed lines.

The foregoing and other objects of the invention will be apparent from the following description when taken in conjunction with the accompanying drawings, wherein like reference characters designate similar parts throughout the several views, and in which Fig. l is a perspective view of the combined transmitting and receiving apparatus in accordance with the invention;

Fig. 2 is a perspective view of a part of the selector mechanism;

Fig. 3 is a side elevational View of the combined transmitting and receiving apparatus according to the present invention;

Fig. 4 is a top view of the receiving apparatus;

Fig. 5 is a cross-sectional view of the combined transmitting and receiving apparatus; I

Fig. 6 is a sectional plan view, with parts broken away, to illustrate various internal mechanisms of the receiving apparatus;

Fig. 7 is a front elevational view, with parts broken away, of the combined apparatus according to the present invention;

Fig. 8 is an end view of the type wheel shaft with the type wheel broken away to show the relative positions of the star wheel and stop arms;

Fig. 9 is a cross-sectional detail of the code bar and selector member arrangement;

Fig. 10 is a fragmental cross-sectional view of the taut wire paper tearing edge; and

Fig. 11 is a modified form of selector mechanism.

The combination sending-receiving apparatus comprises essentially a printing unit indicated generally by the numeral II, and a keyboard transmitting apparatus indicated generally by the numeral l2. In practice, two or more or such apparatuses are interconnected in a telegraphic signal line for intercommunication. Al- 55 though various forms of transmitting mechanisms may be employed, the one chosen to illustrate the present embodiment is in accordance with the transmitter mechanism disclosed in United States Patent No. 1,595,472. As shown in Figs. 1, 3, 5, and 7, the keyboard [2 is provided with a set of keys l3 arranged similarly to the well-known typewriter keyboard, and as illustrated in Fig. 5, key levers I l associatedwith the keys 53 are pivotally mounted on a common shaft and are spring held in normal horizontal position by individual springs I6. Arranged transversely below the key levers M in operative relation thereto are a series of five V-notched selector bars i! (Fig. '7) operated permutably, in a well-known manner, in accordance with the key depressed.

The selector bars I I have pivotally articulated thereto a corresponding series of locking latches i8 (Fig. 7) rocked thereby to either of two positions. Associated with latches l8 are a corresponding series of contact levers IQ for making and breaking contacts 26 (Fig. 3). Contact levers I3 cooperate with individual contact cams 21 mounted on the transmitting shaft 22 (Fig. '7) which is provided with a clutch mechanism 33 controlled by a trip member 40 connected to a universal bar member as set forth in United States Patent No. 1,965,602.

In the operation of the transmitting unit, the depression of a key lever l4 moves the selector bars I? permutably in accordance with a predetermined code combination, the setting of which determines the positions of the locking latches IS. The rotation of the cams 2| is initiated substantially simultaneously with the setting of the locking latches, through the instrumentality of strip member 40, and the locking loop 23 controlled by a cam 59 (Fig. 3) carried on the shaft is permitted to rotate in a counterclockwise direction (Fig. 7) to lock the latches I8 in their selected positions. The setting of latches l8 determines whether the contact levers [9 shall or shall not be affected by their associated cams 2| to cause the opening or closing of their associated contacts 26 to transmit over a signal line, to the receiving station, a predetermined code combination of signaling impulses. The respective notches in the cams 2! are arranged in a helical progression so that upon the rotation of the cam assembly, the contacts controlled by levers 19 will be operated successively. The apparatus herein disclosed is operated in accordance with an equal length letter code, in which each code combination is a permutation of marking and spacing conditions, and is preceded by a start impulse and followed by a stop impulse, according to the familiar start-stop system.

Power is transmitted to the transmitting shaft 22 from an electric motor 25 through a pinion 66 (carried on the motor shaft 24) and spiral gear 16 fixed to shaft 22. As previously mentioned, the motor 25 is arranged to be supported in a hollow or concave portion 26, to compensate for which the key levers 14 have been shaped correspondingly to follow the contour of the portion 26, Fig. 1.

A pinion gear 2'! is fixed to the motor drive shaft 24 and meshes with a gear 28 carried on a vertically disposed main shaft 29 (Fig. Shaft 29 has amxed thereto a collared member 3! (Fig. 3) and is supported therethrough by a supporting bracket 32. The shaft depends therefrom and is guided at its lower end by a bracket 33. Carried on shaft 29 is a sleeve member 34 (Fig. 5) on which are carried, as also indicated in Fig. 3, a spacing cam 35, a transfer cam 36, and a printing cam 31. The functional mechanisms associated with these cams will be described hereinafter.

A toothed or grab clutch, indicated generally as 38, is carried on shaft 29, and is superposed above sleeve 34 (Fig. 5) and comprises a driving portion 39 (Fig. 3) fixed to the shaft 29 and a driven portion 4! articulated by a tongue and groove connection 42 to the sleeve member 34. Driven portion l! of the clutch 38 is normally urged upwardly by a coil spring 43, which movement is resisted by arm 44 of a release ball 45 pivotally carried on a bracket 46 afiixed to the printer frame 47. Arm 44 cooperates with a cam portion 48 integral with the driven portion 4! of the clutch 38. As the release bail is rocked in a manner presently described, the arm 44 thereof will be actuated outwardly (counterclockwise as viewed in Fig. 1) out of engagement with cam portion 48, whereupon spring 43 will urge the driven portion 4| of clutch 38 upwardly into mesh with the driving portion 39 which is constantly rotating. Then, after a single revolution has been completed, arm 44, which has been returned into its position against the clutch portion 4| by a spring 49 (Fig. l), the coaction between arm 44 and the cam portion 43 will cause the camming-out or disengagement of portion M from portion 39. Clutch 38 is referred to as a single revolution clutch. Shaft 29 extends above bearing 32 and carries thereon a selector cam drum 5| and related elements. However, disposed between the cam drum 5| and the bracket 32 and affixed to shaft 29 is a gear 52 which meshes with a gear 53 (Figs. 1 and 5) frictionally carried on an auxiliary shaft 54.

Fixed to the upper end of shaft 29 is a disc 55 (Fig. 3). Cam drum 5| is frictionally driven by shaft 29 through the instrumentality of friction discs 56 and 51. Friction disc 56 is compressed between disc 89 and flange 58 of cam drum 5|, and friction disc 5'! is compressed between fiange 59 of cam drum 5! and a disc 6| by a helical spring 62. By this means, cam drum 5! will rotate with shaft 29 except when it is arrested by the engagement of stop lug 63 integral with cam drum 5! and a stop gate 64.

Stop gate 64 is mounted on a pivot stud 65 secured to an adjustable plate 66 (Figs. 3 and 4) and its upper arm 61 is adapted to be engaged by a latch 68. The latch 68 is pivoted in a journal block 69, and this journal block is in turn mounted on the adjusting plate 66. Plate 66 may be rotated about a pivot stud 7! by means of an orientation control device indicated generally by the numeral 12 (Fig. 4) and as described in Patent No. 2,082,511 granted June 1, 1937. As shown in Fig. 3, both the latch 68 and the stop gate 64 are carried on the adjusting plate 66 and are movable therewith. By means of this orientation adjustment, the position of arm 13 of stop gate 64 may be altered to obtain the best operating conditions of the selector, as described in Patent No. 2,082,511. Associated with latch 68 is a bell crank lever 74 (Fig. 3) pivotally carried in a journal block 15 mounted on plate 16 of the orientation device. Associated with the vertical arm of bell crank 74 and carried in block 15 is a plunger 'il' which, as shown in Fig. 4, cooperates with arm 78 of a selector lever 19. Latch 68 is normally biased in a clockwise direction (as viewed in Fig. 3)

by a coil spring 8| so that it is normally brought into locking relation with arm 81 of stop gate 84- and simultaneously therewith bell crank I4 is maintained in its counterclockwise position and plunger IT in its retracted position. 'Thus when plunger I1 is depressed or urged rightwardly, as viewed in Fig. 3, by the action of selector lever I8, Fig. 4, as will presently appear, bell crank 74 will be rocked clockwise and latch 68 will be rocked counterclockwise against the action of its spring 8! to effect the release of the selector cam drum 5I for rotation, which is effected by the pressure of stop lug 63 against arm I3 of the stop gate 84, which pressure, owing to the release of latch 88 from arm 61, will cause the stop gate 64 to be rotated against the action of its spring 82. When lug 63, in its rotation, escapes arm I3 or stop gate 64, the stop gate will be returned to its locked position in engagement with latch 88 by the action of spring 82, so that when lug 83 again reaches arm I3, it will be arrested thereby due to the detention of arm 81 by latch 88.

Having reference now to Fig. 4, the details of the selector mechanism actuated by the cam drum 5| will be described. The selector cam drum 5I is rotated at a speed substantially the same as the speed of code impulsing, and operating in conjunction therewith is a selector magnet 83 which may be connected either directly or indirectly (through a line relay, for example) to the signal line. Selector magnet 83 is carried on a bracket 84 amxed to the printer frame, and associated with the selector magnet 83 is the selector lever 18 pivoted at 85. Selector lever 18 has a pole piece 88 which cooperates with the core 81 of the selector magnet 83. and is biased, upon deenergization of magnet 83, in a clockwise direction by a spring 88 distended between the pole piece 88 and a spring anchor arm 88. Upon energization of selector magnet 83 by the impression of marking current on the signal line, pole piece 88 will be attracted, causing selector lever I8 to be actuated in a counterclockwise direction against the tension of spring 88.

Selector lever I8 terminates in a T-shaped portion 8! having downwardly extending arms 82 (Fig. 3) which constitute abutments which cooperate with arms 83 on the right ends (Fig. 4) of aseries of selector fingers 84. Selector fingers 88 comprise a series of thin, fiat members arranged in superposed relation between guide plates 85, and are equal in number to the signaling elements of the code on which the receiving printer operates. Thus, if a five-unit code is employed, there will be five of the selector fingers 84, whereas a six-unit code will require siX selector fingers. The guide plates 85 are mounted on studs 98 secured to the selector mounting plate 87 (Fig. 3), and are spaced by washers (not shown). The circular right ends 88 of selector fingers 84 engage corresponding sockets of thin fiat bell crank levers 88 pivoted on a common shaft I8I. Individual springs I82 bias the bell cranks 88 in their clockwise direction whereby the selector fingers 84 are urged leftwardly (Fig. 4). The pointed ends I83 of hell crank levers 88 are thus maintained in contact with the selector cam drum 5I.

Selector cam drum 5! is provided with a helically arranged series of cam projections 55 (Figs, 1 and 3), one for each of the bell cranks 88, which function to rotate the bell cranks 88 in succession and thus draw the selector fingers 84 rightwardly (Fig. 4) successively as the selector cam drum 5| is rotated. In addition to the longitudinal movement, the selector fingers 84 have a laterally swinging movement between a pair of studs I84. The setting of any selector finger 84 either to its clockwise or counterclockwise position is determined by the selector magnet 83; that is, each selector finger 84 is shifted clockwise or counterclockwise by having one or the other of its arms 83 drawn against one or the other of the abutments 82 of the T-shaped portion 8I of selector lever 18. As the signal impulses are received over the telegraph line, the selector magnet 83 is energized and deenergized depending upon the nature of such impulses, and as a result thereof, the abutments 82 are caused to cooperate with one or the other of the arms 83 to provide a fulcrum about which the respective selector fingers 84 are rotated.

Since in start-stop systems the normal stop condition of the line is marking or current on the line, the selector magnet 83 will be normally energized and the selector lever I8 will be attracted and held in its counterclockwise position. Upon the receipt of a start impulse, which is of spacing nature, the selector magnet 83 will become deenergized and the spring 88 will bias selector lever 18 in a clockwise direction causing arm T8 to depress plunger 11 to release latch 88 from stop gate 64, thus permitting the selector cam drum 5|, through the release of its lug 63, to rotate, which rotation ensues during the reception of a series of impulses constituting a signal. During the rotation of selector cam drum 5|, the cam projections 55 successively cooperate with bell crank levers 88 causing them to rotate against the action of their spring I82 to bring the selector fingers 84 rightwardly toward the U-shaped portion 8| of selector lever I8. At the instant of reception of each code impulse, a cam projection 55 coacts with a bell crank 88 sothat depending upon whether the code impulse is of marking or spacing nature, the selector lever I8 will assume either its clockwise or counterclockwise position to permit the abutment of one or the other of the arms 83 on selector finger 94 with the corresponding depending arm 82 on selector lever I8.

Thus, upon the reception of a marking impulse, selector lever I8 will assume its counterclockwise position to cause the rocking of selector finger 84 to its clockwise position. On the other hand, if the received impulse is of spacing nature, selector magnet 83 will become deenergized and selector lever I9 assumes its clockwise position whereupon selector finger 84 is caused to rock to its counterclockwise position or the position shown in Fig, 4.

The left end of each of the selector fingers 84 cooperates with a T-lever I85 pivoted on a common shaft I88 and are likewise arranged between guide plates 85. The reciprocation longitudinally of fingers 84 by bell cranks 88 under the influence of springs I82 will effect the rocking of T- levers I85 to their clockwise or counterclockwise position depending upon whether fingers 84 are in their counterclockwise or clockwise position, respectively. T-levers I85 are pivotally articulated to individual code bars II5, I28, and I2! (Figs. 7 and 9) of a series of code bars I81 slidably mounted on studs I88 and I88 (Fig. 4). The series of code bars I81 are set permutably in acordance with the received code combinations of impulses by the selector mechanism just described, and are retained in their set position by the coaction of detent member I I I with detent notches H2.

Cooperating with the series of code bars I 01 are a plurality of selector drop bars, or abutment members II3 (Fig. 2). In the present embodiment there are eight members I I 3, and associated with each member II3 is a companion abutment member Md. The ends IIQ of arms III; of selector members IIS and H4 provide abutments for a series of stop arms or projections I09 and I22 helically arranged around and affixed to a cylinder I25 (Figs. 5 and 8). Incidentally, each of the arms II 6 has a vertically extending guide lug III which cooperates with a guide comb H8 (Figs. 4 and 5). Stop arms: I 80 and I22 terminate in a pair of stepped shoulders 235 and I24 (Figs. 7 and 3), one or the other of which strikes a selected member H3 or II I, as will presently appear. Although the series of code bars IIll effeet the selection of the selector members II 3 and/or II I, three of the code bars II5 (Fig. 9), when operated permutably, efiect the selection of one of the eight members I I3. The bottom code bar I25 of the series of code bars III? is so arranged with its notches as to permit or prevent the selection of the companion selector member I Id. The fifth or top code bar I2I has its wards or projections only about one-half as high as the wards of the code bars I I5 so that, compared with code bars I I5, code bar I2! may in effect be deemed to have notches of two different depths, one depth functioning to permit a predetermined entrance of the selector member H3 therein to coact with the stop arms I09 or I22 in a certain manner, and the deeper notches permitting a further movement of the selector bars I I3 to cause their coaction with the stop arms in a different manner. As shown in Fig. 9, the selector members I I3 cooperate only with the upper four code bars I I5 and I2 I, and the companion selector member I I I cooperates only with the bottom code bar I25. Although the abutment members H3 and H4 present the apperance in Fig. 4 of being exactly alike and that the top edges of all said bars are at the same level, a difference does exist, as shown in Figs. 2, '7, and 9, in that the top edges of bars II l are at a lower level than the top edges of bars I I3. For example, referring to Fig. 4, abutment members II3 engage the top code bar I2I and members I I4 do not engage the code bar I2I, but only the bottom code bar I28 (see Figs. 2 and 9). In the position of code bar I 2 I, as shown in Fig. 4, the third and fourth abutment members H3 (reading from the bottom of the figure) are blocked by code bar I2I, while with the alternative position of code bar I2I, the first, second, fifth, sixth, seventh, and eighth abutment member I I3 would be blocked. Each selector member I I3 has a laterally disposed pin or stud I33 (Fig. '7) positioned in the path of rotation of the companion member I I 4, so that each selector member I I 3 can, under certain operating conditions, exercise control over its companion member I I I, as will be discussed presently.

Selector members I I3 and I I4 are normally biased in a clockwise direction by springs individual thereto, Figs. 2 and 7. Thus, when the middle three code bars I I5 are positioned in accordance with their corresponding code impulses of the code signal, an alignment of notches results to effect the selection of one of the selector members H3. The amount of its clockwise rotation in response to the pull of its spring is determined by the selective position of the. top code bar I 2 I; for example, the surface III] (Fig. 4) of one of the truncated Wards of code bar I2I (Fig. 9) will permit the selector member I I3 to rotate only to to by the shaft 54.

such an extent that its end H9 is presented into the path of the shoulder 230 of a stop arm. III!) or I22. If the top code bar I2! is shifted so as to permit the movement of selector member H3 against the bottom I23 of a deep notch, further rotation is permitted to selector member II3 so that its end I I9 is presented into the path of shoulder I24 of its associated stop arm I553 or I22.

With the permutationsof the three middle code bars II5, eight selections are possible. With the addition of the top code bar I2I, the number of selections is doubled, thereby permitting, with selector members II 3, sixteen possible selections. Now, with the further addition of the bottom code bar I20 and the response thereto of selector members I I4, the number of selections is increased or again doubled, giving thirty-two possible selections in the following manner: When the bottom code bar I20 is in one of its longitudinal or selective positions, its lugs thereon act to block the clockwise movement of selector member II I, but when the bottom code bar I28 is moved to its alternate position, a notch is presented to the vertical arm of the selector member II-I whereby, when the main selector member H3 is selected and permitted to rotate clockwise under the action of its spring IIB, the selector member II I associated with said selected member IE3 is permitted to follow, in which case the actuated member I I I is held against the laterally disposed stud I39 by its spring, and in this manner the main selector member H3 and its companion member I I4 move as a unit.

The shoulders 23!] and I24 on each of the helically arranged arms Illii and I 22 are so positioned angularly (Fig. 8) as to correspond with the angular positions of type faces on a type wheel @223 so that when one of the selector members. H3 and II4 is moved into one of the paths of rotation of shoulders 236 and/or I24, the cylinder I25 will be permitted to rotate in a counterclockwise direction until one of the stop arms Hit or I22 is arrested by the selected member H3 or II I. In this manner a character on the type wheel is brought into printing position.

Referring to Figs. 5 and 7, thecylinder I25 which carries the stop arms I85 and I22, is rotatably mounted on shaft 54 at the left end of which (as viewed in Fig. 5) is carried the type wheel I26. The left end of the shaft 54 is counterbored to receive a stub shaft I28 integral with the type wheelassembly and is provided with an open ended slot I28, which engages a pin I3I integral with shaft I28. Shaft 55 is journaled in a bushing I32 carried in a bracket I33 on the printer frame. Shaft 55 is also similarly journaled in bracket I35. A constant torque is applied to shaft 54 through friction means I35 associated with a constantly rotating gear 53, which meshes with gear 52 afiixed to the vertical main shaft 29. The frictional connection between gear 53 and shaft 55 is maintained by a coiled compression spring I38.

Rotation is imparted to cylinder I25 by the I shaft 54 through the instrumentality of a driving disc I39 afiixed to shaft 54. Disc I39 has a laterally disposed arm III which, through an interponent I42, coacts with an arm I43 integral with cylinder I25. Thus, when cylinder I25 is free to rotate by the removal of selector members H3 and II4.from the paths of stop arms I22, rotational movement will be imparted there- Arms MI and I43 are normally biased attrahently by a spring I 40 coiled about shaft 54. Interponent I42 is integral with 7 a sleeve 245 slidably and rotatably carried on shaft 54, which will be further discussed in connection with the shift and unshift functions.

As previously described, there is mounted on the main shaft 29 (Fig. 5) a sleeve 34 which carries, among other cams, a transfer cam 36, which cooperates with a follower roller I36 (Figs. 6

and '7) carried at the extremity of a transferlever I44 (Figs. 1, 6, and '7) pivotally mounted on a vertical shaft I45. The forward end of transfer lever I44 is pivoted to one end of a link I46 (Fig. 1), the other end of which is pivoted to a depending arm I4! of a transfer bail I48. Transfer bail I48 is rockably carried on a shaft I49 and is provided with a web portion I5I positioned beneath and spanning all of the selector members H3 and H4.

Upon the reception of a code signal, a start impulse thereof acts to initiate the rotation of the selector cam drum 5I to effect the selective positionment of the selector fingers 94 as previously described. However, due to the locking action of the detent III upon the code bars III'I (Fig. 4), springs I62 of the selector levers 99 are unable to effect, through 'T-levers I65 (until at a predetermined instant), the shifting of the code bars I6! to a succeeding selection. Hence, through the instrumentality of the transfer mechanism, this transfer of th-e'setting of the selector fingers 94 to the code bars III'I is accomplished. Therefore, at a predetermined instant in the cycle of rotation of cam drum 5|, a cam projection I96 thereon acts upon an arm I52 of clutch release bail to effect the disengagement of arm 44 from cam 46 of the driven portion M (Fig. 3) of clutch 38, thus permitting the engagement of portions M and 39 of the grab clutch 38 to effect the rotation of cams 35, 36, and 31, of which cam 36 acts to effect the transfer operation.

Upon rotation of cam 36, rotation is imparted to lever I44, which through link I46 (Fig. 1) rocks the transfer bail I48 in a counterclockwise direction which, through its web portion I5I,

" rocks all of the selector members H3 and H4 tion, cam 36 permits the transfer bail I48 to be rocked to its clockwise position thus allowing selector members II 3 and H4 to be free to respond to the pull of their respective springs I66 and III) into engagement with the series of code bars IUI, as a result of which one of the selector members H3 will find an alignment of notches, whereupon the selected member H3 will rotate clockwise a greater distance into the path of its associated stop arm III!) or I22. is invariably selected, the selection of its companion member I I4 being effected simultaneously with a member H3 only when it is permitted to do so by the proper positioning of code bar I26. That is, when it is desired to select a member H3 only, its companion member II4 is blocked against rotation under the action of its spring I'Iii by the code bar I26, and the pin I36 carried by member H3 will be moved free of the companion member H4. On the'other hand, when A member H5 it is desired to select a member II4, the alignment of notches for its main member I I3 is made,

and also, code bar I26 is shifted out of blocking the teeth or points of which have a definite relation, as will presently appear, with the stop arms I66 and I22, and hence the angular positions of the type faces upon the type wheel I26.

Cooperating with the teeth on the star wheel I53 is an intercepting arm I54 of a lever I55 (Fig. 1) which is pivotally carried on shaft I49. Lever I55 is provided with a depending arm which coacts with an eccentric adjusting screw I56 mounted on arm I4'I of transfer bail I48. A spring I51 distended betweenan extension on link I46 and a lug integral with lever I55 tends to cause said depending arm to bear constantly against the adjusting screw I56 and tccause lever I55 and transfer bail I48 to rotate as .a unit. Thus, when transfer bail I46 is effective during the performance of the transfer operation, as previously described, vto rock selector members H3 and H4 out of. the path of stop arms I06 and I22, the cylinder I25 will not rotate or spin freely because of the fact that intercepting arm I54 has been biased by spring I51 into the'path of the oncoming tooth of the star wheel I53. Then when the transfer bail I48 is returned to its unoperated position, intercepting arm I54 is withdrawn from engagement with the tooth on the star wheel I53 whereupon star wheel I53 and the cylinder I 25 are free to rotate until one of the stop'arms I66 or I22 is arrested by the impingement of one of the shoulders 236 or I24 thereon against the end I I9 of the selected member H3 or M4 to thus bring a type face on the type wheel I26 into printing position.

' Printing cam 3'! (Figs. 1 and 3) cooperates with a follower roller I58 carried on one arm of a printing control lever I59 pivotally mounted on the vertical shaft I45. The lever I59, as shown in Fig. 6, is normally biased in a counterclockwise direction by aspring 3M sufficient in tension to overcome the tension of printing spring I to be described. Lever I59 is-articulated to link I6I by a shoulder screw 366 which by opposing tensions of springs 30! and I65 is retained in the forked end of a link IISI, the-other end of which is pivoted to a printing arm I62 pivotally mounted at I63 upon a bracket I64 integral with the printer frame 41 (Fig. 5). Distended between printing arm I62 and frame 411 is a printing spring I65. Printing arm I62 terminates at its upper end with a striking surface I66 which acts upon the type wheel I26 to effect printing.

The type wheel I26consists of acircular disc, having cut around the circumference thereof equally spaced radial slots I61 (Fig. 8) thus forming a series of radiating reeds I66 upon which letters and figures are arranged in a single row. shaped knife edge I56, which, as printing is being effected, projects into a notch in a peripherally notched corrector disc I66, to properly align and hold the type wheel in printing position in. Printing arm I62 is pro-- well-known manner. vided, betwen the link IGI and the endI66, with a hookportion I69 which engages a flange I'II Adjacent the striking surface I66 is a \lassociated with type wheel I26. In this manner,

, mounted on printing arm I62.

printing arm I62 is positively actuated by printing lever 59 to impart axial movement to type wheel I 26 both before and after printing; the purpose of which is to permit visibility of a printed character. To achieve this result, type wheel I26 is Withdrawn from the printing platen I 2 a substantial distance by means of the interengagement of hook I69 and flange I1I.

To effect operation of printing arm I62, the printing cam 31 driven by clutch 38 passes its high portion under roller I58 whereby clockwise rotation is imparted to printing lever I59 and shoulder screw 399 is moved toward the end of the slot in link I6I, releasing link I6I and printing arm I62 to permit printing by the printing spring I 65. However, the first portion of the movement of printing arm I62 is employed, through the instrumentality of hook I69 and flange Hi, to bring the type wheel within printing range of the platen I12, whereafter the further movement of printing arm I62 by spring I65 is utilized to present the end I66 thereof against a reed I68 of the type wheel I26, thus bringing the type face thereon against the record material disposed in front of the platen I12. Cam 31 thereafter permits the printing lever I59 to rotate counterclockwise, to effect leftward movement to link I6I to bring printing arm I62 to its counterclockwise position and stretching spring I65 thereby storing energy therein. At the same time, through hook I69 and flange "I, type wheel I26 is withdrawn from the platen to permit visibility of the character last printed. To permit proper adjustment between printing arm I62 and link I (H, printing arm I62 is provided with an enlarged hole to receive the shouldered clamping nut I13, and to facilitate this means of adjustment, link I6I is provided with an open ended slot I14 adapted to engage a guide pin I15 Platen I12 is carried in a carriage or frame indicated generally by the numeral I16 (Figs. 4 and 5). Associated with platen I12 are pressure and guide rollers I11 which are of well-known construction and are not a part of the present invention. The platen carriage I16 is slidably mounted upon the frame 41 of the printer through the medium of ball bearings I18 and I19. Mounted on the platen carriage I16 is a spacing rack I8! (Figs. 6 and '7), and cooperating with rack I8I is a spacing pawl I82 pivotally mounted on an arm I 83 of a plural arm lever I 84. Pawl N12 is normally biased into engagement with rack i8! by a sp1ing'I81. Arm I85 of lever I84 carries a follower roller I86 which cooperates with the spacing cam 35 previously mentioned. Thus upon rotation of cam 35, whenarm 44 is disengaged from the driven clutch member 4I, clockwise rotation is imparted to lever I84 causingpawl I82 to be actuated leftwardly, as viewed in Fig. 6, to move rack I8]v one tooth and to move thereby the platen carriage I18 one character space. To retain the platen carriage at the character space position to which it has been just moved, a detent pawl I89 is provided which also cooperates with rack I8I and is spring biased thereagainst by a spring I89. As the platen carriage is actuated leftwardly, as viewed in FigsA,

6, and 7, it tends to wind up a carriage return spring enclosed in a spring housing I9I (Fig. 4),

thus storing up energy to effect, upon receipt of the carriage return signal, the carriage return operation, the carriage return spring being con- -printing and spacing operations. As a function selector member i It is rocked clockwise by its spring I19, its depending arm I92, 2I2, 221 or 228 acts on a bail portion i93' of a printing and spacing cut-out lever i 94 (Figs. 1 and '7) to cause said lever 594 to be rocked clockwise. Lever I94 is normally biased in a counterclockwise direction by a spring 292.

Lever I95 has an arm I95 which extends in front of and blocks, under certain operating conditions, a projection 96 (Figs. 1 and 5) integral with link I9 i, thus during the operation of a function wherein it is desired to prevent the printing and spacing operations, arm H5 is presented into the path of lug I96 so that when the printing spring I95 tends to operate the printing arm 562, it is prevented from so doing by the blocking action of lever arm I95 upon link I6I, thus cutting out the printing operation when certain functions are performed. Simultaneously therewith, character spacing of the platen carriage I'ifi is prevented in the following manner: Lever I9 5 is also provided with a curved arm I91 (Fig. 2) to the terminal end of which is pivoted one end of a link I98, the other end of which is pivotally articulated to one arm of a bell crank lever t99 (Fig. 6) pivotally mounted on the p-rinterframe 41. The other arm of bell crank I99 carries a stud 29I engaging a slot in pawl I82. Accordingly, when the printing and spacing cut-out lever I94 is permitted to operate upon the selection of a function, not only will the arm I95 thereon act to block the movement of link I6! and prevent the printing operation, but also, link I98 will be actuated rightwardly (as viewed in Fig. 6) to rock bell crank lever I99 clockwise to effect the withdrawal of pawl I 82 from rack I6i. Thus, when lever I84 operates in a normal manner to perform the spacing operation, its action will be negatived by the prior withdrawal of pawl I82 from the rack I 8I.

When a carriage return code signal is received to initiate the carriage return operation, the code bars I91 are set permutably in response thereto, thereby effecting the selection of the particular selector member I59 that is provided with depending arm and that is also provided with hula,

a projection 28!! which acts upon an arm 2513 to effect the withdrawal of both pawls 88 and I82 from the rack H85 whereupon the platen carriage 515 is free to respond to the pull of the carriage return spring enclosed in the housing I9I. Pawls A82 and I86 are held withdrawn from the rack I 6! for the duration of the car riage return cycle, to insure the full return of carriage I16, by a latch 265 (Fig. 6) pivoted at 266 to the printer frame 41. Latch 265 is adapted, through the action of spring 261, to engage arm 261 of member 294, until it is disengaged by the impingement of a pin (not shown), carried on the bottom side of platen carriage I16, upon the end 268 of latch 265. To absorb the blow caused by the rapid return movement of the platen carriage HS in response to the action of the carriage return spring, a dashpot 209 is provided, a striker screw (not shown) being carried on the carriage I16 to strike the upper end of the dashpot operating lever 2I0 (Fig. 5) pivotally mounted at 2I I on the printing frame 41, the lower end of which is pivotally articulated to a plunger associated with the dashpot 209 in the usual manner.

The line feed operation is controlled in a manner similar to the carriage return operation, by a particular selector member H4 which is selected upon the receipt of a line feed code signal. The line feed selector member II4 has a depending arm 2I2 to the lower end of which is pivoted one end of a link 2I3 (Figs. 1, 2, and '7) the other end of which is pivoted to an arm 2I4 (Figs. 1, 6, and '7) pivotally carried at the extremity of an arm 2I5 of the plural arm lever I34. Thus, when the line feed selector member H4 is selected, it is permitted to rotate clockwise thereby drawing the link 2I3 leftwardly (Figs. 1 and 6) to bring the free end of arm 2I4 into the path of depending arm 2I6 of a line feed lever 2I'I pivoted at 2I8 to the printer frame 47. Then, when the plural arm lever I84 is actuated in a clockwise direction by the spacing cam 35, arm. 2I4 is urged forwardly as viewed in Fig. 6, or leftwardly as viewed in Fig. 3, to rotate the line feed lever 2I'I clockwise, which movement is effective, through a line feed pawl 2I9 carried on the end of lever 2I'I, to rotate the line feed ratchet 22I a single angular step. As shown in Fig. 4, the line feed ratchet 22I is fixed to one end of a shaft 222, to the other end of which is fixed a gear 223 which meshes with a long pinion 224 so that the gear 223 has slidable meshing engagement therewith. In this manner, gear 223 is operatively connected with pinion 224 regardless of the character spacing position of the platen carriage I16. Therefore, when the ratchet 22I is rotated one angular step, this rotation is imparted through shaft 222 and gear 223 to the pinion 224, and thence through idler gear 225 to a gear 226 fixedly associated to the platen I72. Simultaneously, with the performance of the line feed function, the depending arm 2I2 also acts upon bail I93 to effect the suppression of the printing and spacing operations in the manner previously described.

The shift and unshift mechanisms are controlled by the particular selector members II4 having depending arms 221. and 228, respectively (Figs. 1 and 2). Pivotally connected to the depending arms 22'! and 228 are links 229 and 23I, respectively. Link 229 is pivoted to a latch member 232, and link 223i is pivoted to a latch member 233, which latch members are pivoted by common pivot 234 (Fig. 2) to the end of an arm 235 of the plural arm lever I84 (Figs. 1, 2, 5, and 6). Each time that the plural arm lever I84 is rocked by its cam 35, latches P2 and 233 are reciprocated frontwardly and rearwardly of the apparatus (or leftwardly and rightwardly, respectively. as view in Fig. 5). Latches 232 and 233 terminate in their free ends with laterally disposed poritions, which under certain predetermined conditions engage the ends of arms 236 and 23?, respectively. Arms 236 and 231 are pivoted at 238 and 239, respectively, to a shift control lever 24I. pivoted .at 242 to the printer frame 41. Lever 24I is provided with a vertical extension, carrying at its upper end a stud 243 which fits into a groove 244 in the periphery of a sleeve 245 slidably mounted on the shaft 54. Integral with sleeve 245 is the interponent I42 previously described, which is disposed between the two arms MI and I43. Thus, when the shaft 54 rotates, the arm I4I of disc I39 fixed to shaft 54 imparts rotation not only through arm I42 to the sleeve 245, but also through interponent I42'and arm I43 to the cylinder I25. Arms MI and I43 are normally biased attrahently by a common spring I43 (Figs. 3 and 6), and when the arms MI and I43 assume the position closest to each other, the relationship between the stop arms IE2 and I22 and the type wheel I25 is such as to print upper case characters. However, when the sleeve 245 is shifted leftwardly, as

viewed in Fig. 5, or forwardly, as viewed in Figs.

1 and 6, in a manner presently to be described, the arm I42 will act upon the inclined cam surfaces 24I and 248 (Fig. 6) on arms MI and I43, respectively, to spread said arms I4! and I43 apart against the action of the common spring I43, thereby changing the angular relationship between the stop arms Hi and I22 0n the cylinder I25 and the characters on type wheel I23 one character position tothereafter print the characters in the lower case position. The angular relationship between type wheel I26 and cyl-. inder I23 is thus alterable because the type wheel is constrained to move with shaft 54 (to which disc I39 is also fixed) and cylinder I25 is freely mounted on said shaft. Therefore, it is manifest that through the medium of arm I42 and cam surfaces 241 and 248, the arms MI and I43 may be spread apart to change said angular relationship, and upon retraction of arm I42 and the concurrent action of spring I42, the original relationship will be restored.

To effect the shifting and unshifting operations, one or the other of the arms 2213 or 22?, respectively, is actuated upon the selection of its associated selector member I I4 in response to the shift or unshift code combinations, respectively. Upon the receipt of an unshift code combination, the particular selector bar H4 having the depending arm 228 will be actuated in a clockwise direction which, through link 23I, will rotate latch 233 clockwise, as viewed in Fig. l, to bring its laterally disposed end into cooperative relation with the end of lever arm 231, whereafter upon the succeeding rocking movement ofplural arm lever I34 imparted to it by cam 35, the latch 233 will be actuated rearwardly and in so doing will pick up the lever arm 23'I, which will thereby also be actuated rearwardly to impart counterclockwise rotation (as viewed in Figs. 1 and to the shift control lever 24!. This movement of lever 2M will cause, through stud 243, the sleeve 245 to be shifted leftwardly whereby the interponent I42 will act upon the cam surfaces 241 and 248 to spread the arms I4! and I43, respectively, thus changing the angular relationshipbetween the stop arms I23 and I22 and the characters on type wheel I25 to print thereafter unshift or lower case characters, until a shift code combination is subsequently received.

When the shift code combination is received, the selector member H4 provided with the depending arm 22! is, upon selection, rocked clockwise to actuate the link 229 leftwardly to rotate arm 232 clockwise to bring its laterally disposed end into cooperative relation with arm 236 whereafter, upon the ensuing rocking movement of plural arm lever 184, the arm 232 will be reciprocated; and upon the rearward movement in its reciprocating cycle, arm 232 will pick up the lever arm 235 to impart therethrough clockwise rotation to shift control lever 24I, which through stud 243 will shift the sleeve 245 rightwardly to retract interponent I42 from the cam surfaces 24? and 248, whereupon spring I43 will again draw the arms MI and I43 together, thus bringing the stop arms In!) and I22 and the characters on the type wheel I 26 into that relation whereby shift or upper case characters will thereafter be printed. Simultaneously with the performance of the shift and unshift functions, the depending arms 228 and 22?, respectively, also act upon bail I93 to effect the suppression of the printing and spacing operations as described hereinbefore. The position of the shift mechanism as shown in the drawings is such as to effect the printing of upper case characters.

The type wheel employed in the apparatus according to the present invention is shown in Fig. 8, and, as previously mentioned, comprises a'fiat circular disc having a series of radial slots I6! therein thus providing a plurality of radiating reeds I 58 carrying, adjacent their circumferential ends, type faces 252. The lower case characters are designated by line 253, and the upper case characters are designated by line 254. It is thus noted that upper case and lower case characters are arranged alternately. However, for the purpose of the present disclosure, the angular distance between successive lower case characters is deemed to be one step, and correspondingly-the angular distance between upper case characters is also deemed to be one step. Therefore, the distance between adjacent lower case and upper case characters is referred to as one-half step; that is, when the angular relationship between the characters on the type wheel and the stop arms I00 and I 22 is such as to cause the printing of lower case characters, each shoulder on the ends of the stop arms I00 and I22 is effective with its associated selector member II 3 or II4, as the case may be, to position a lower case character into printing position. Then, when it is desired to print upper case characters, the relationship between stop arms I I and I22 and the selector members II3 and'I I4 is not changed, but the type Wheel is shifted angularly, by the aforedescribed shift mechanism, in relation to the stop arms so that when the shoulders on the stop arms coact with the selector members H3 and H4, an upper case character will be presented to the printing position.

While the total number of permutations obtainable with five code bars is thirty-two, and with the shift and unshift possibilities, this total number is doubled; namely, to sixty-four, the type wheel I26 would normally be provided with sixty-four angular positions which, in the present arrangement of characters, would leave eight more blank spaces than are shown in Fig. 8, to allow for the performance of functions. However, with the apparatus according to the present invention, provision is made for suppressing the printing and spacing operations when functions are performed, thus making it possible to eliminate eight of the blank spaces, thus permitting the type wheel to be divided into eight less divisions, having thereby fifty-six equal divisions instead of sixty-four, thus strengthening considerably the type wheel by making the reeds of greater width. It isseen that by the elimination of eight blank spaces, the teeth on the star wheel 1'53 have been distributed to provide an arrangement (as indicated in Fig. 8) whereby on one side of the type wheel the teeth are arranged to span eight characters (as at I 2?) for each of four tooth-spaces on the star wheel I53, while on the other side of the type wheel theteeth are spaced to span six characters (as at 220) for each of four tooth-spaces on the star wheel, two blank spaces having been eliminated for each of the latter four tooth-spaces.

With the spacing of the teeth on star wheel I53 as indicated at I27, the stop arms I22 are arranged with their shoulders 235 and I24 spaced at regular angular intervals. However, byeliminating blank positions and thus reducing the number of character positions on the type wheel, it is possible to alter the position of certain ones of the shoulders I24 by making the shoulders I24 of two successive arms I 22 and H10 coincident. The shoulders 230, then, of the arms I00 are thus advanced two angular spaces, to assume the angular position that would otherwise be assumed by its associated shoulder I24. the two arms I22 embraced in space 302 (Fig. 8) comprise four stop positions and include three of the aforementioned full steps; while the two arms I90 and I22 embraced in the space I3! comprise three stop positions and include two full steps. The teeth or points on star wheel I53 are so spaced as to stop the cylinder I in one of eight angular positions, wherein a pair of stop arms as I and I22 (or I22 and I22) associated with each pair of abutment members H3 and H4 are both in front of the ends II9 to assure that said abutment members, when selected, are presented into the path of the stop arms in proper sequence; that is, so that the forward or leading shoulder in each oncoming pair of stop arms is the first shoulder of the pair of arms to cooperate with the pair of abutment members in the event that the pair of abutment members is selectively operated simultaneously. There being eight groups of shoulders I24 and 230, there are eight positions of entry for ends H9, and the star wheel I53 is provided with eight points to cooperate with an arm I54 controlled by the transfer bail I48.

A further feature of the invention consists in providing a taut wire paper knife associated with the platen H2 as shown in Figs. 3, 4, and 10. As illustrated in Figs. 3 and 4, a backing plate 255 is mounted in platen carriage I76 above the platen rendering it taut for paper carrying purposes. As shown in Fig. 10, wire 256 is folded back at its ends and is anchored in adjustable screws 25! and 258 carried in end plates 259 and 26I, respectively of the platen carriage I16. The desired tautness of the wire 255 is established by turning the set screws 25! and 258 sufficiently, and lock nuts 25-32 and 263 are provided to maintain the tautness. The utility of a taut wire paper knife is emphasized by the fact that it does not interfere with the lines of printing due to the fact that it is of sufficient narro-Wness to be readily confined between the lines of printing.

General operation A complete description of the cycle of operations involved in the printing of a character and also in the operation of a function will be In other words,

I12, and positioned in front of plate 255 -1s a wire 256 which is provided with means for described. For example, it will be assumed that a character is to be printed, following which a function, such as Shift is to be performed.

As the signal impulses representing the character are applied to the selector magnet 83, the selector cam barrel 5| is released for operation in the manner fully described hereinbefore, and the selector fingers 94 are successively positioned in accordance with the received impulses. About the time that the last of the impulses of the character code signal has been received, the clutch throwout lever 44 is tripped by operation of the lever I52 by the cam I93 of the cam drum 5| and the clutch 38 becomes engaged, whereby rotation is imparted to the cams 35, 36, and 31. Almost immediately after the cams begin to rotate, the cam 36 operates its follower I36 (Fig. 6) which in turn, through lever I44, operates transfer bail I48, whereby the character code combination, in accordance with the setting of the selector fingers 94, is permitted to be transferred to the code bars I01. As the operation of the transfer bail I48 causes the particular drop bar 3 which had been selected previously to be lifted out of the notches (and the detent III to be lifted out of the notches H2) the code bars I01 are shifted to present a new alignment of notches, whereafter upon the return of the transfer bail I48 to its former position another one of the drop bars H3 will follow into the new alignment of notches.

Incidentally, while the transfer bail 143 was thus operated to raise the drop bars out of engagement with the code bars I31, thereupon lifting ends H9 out of abutting relation with the stop arms I09 and I22, the cylinder I25 was prevented from spinning by the presentation of end I54 of lever I55 into the path of the oncoming tooth of star wheel I53. Then, when the transfer bail I48 is returned to its clockwise position, end I54 is withdrawn from engagement with star wheel I53 to permit the rotation of cylinder I25 until one of the shoulders 238 or I24 of stop arms I03 or I22 abuts the end I I9 of the newly selected I drop bar I13 or II4. Immediately after the type wheel I26 has been stopped under the control of cylinder I25, the printing cam 31 acts upon follower roller I58 to rotate lever I59 clockwise (Fig. 6) which permits the printing spring I65 to actuate the printing arm I62 clockwise (Fig. 3).

As previously mentioned, type wheel I26 is so spaced from the platen I12 as to provide visible printing. Therefore, the first portion of the clockwise movement of printing arm IE2 is utilized (through hook I69 and head I1I) to bring the type wheel I26 within printing range of the platen, whereafter the remainder of the operative stroke of the printing lever I62 is employed in effecting, through end I55, the printing operation.

In proper timed relation with the printing operation, and preferably immediately thereafter, the character spacing of the platen is performed through the instrumentality of cam 35, which through its follower roller causes lever I85 to be rotated clockwise (Fig. 6), whereupon spacing pawl I82 is actuated leftwardly, to move, through spacing rack 18!, the platen carriage I15 leftwardly one character space.

Assuming that the next signal received is a shift code combination, the selector magnet 83 will respond to the impulses thereof to initiate the rotation of the cam barrel EI and to control the setting of the selector fingers 94, in the manner previously described. At a timed instant during the rotation of cam barrel 5|, the cam I30 thereon will, through ball 45, effect the disengagement of clutch arm 44 and the consequent initiation of rotation of clutch 38. Upon the operation of transfer bail I48 through the instrumentality of transfer cam 35 the setting of the code bars I01 in accordance with the shift code combination is permitted. When the transfer bail is returned to its normal position, the particular drop bar II4 having the depending arm 2211s selected (that is, permitted to fall into an alignment of notches) and under the action of its spring I13 is permitted to rotate in a clockwise direction. Link 229 is thereupon actuated in a leftwardly-direction to bring arm 232 into operative relation with arm 235 so that when the plural arm lever I84 (Fig. 6) is actuated in a clockwise manner by cam 35, latch member 232 will be reciprocated rightwardly, as viewed in Fig. 5, and will engage arm 236 and impart. thereto similar motion, causing the shift control lever 24I to be rocked in a clockwise direction which, through pin 243 (Fig. 1), will urge sleeve 245 to the right, permitting spring I40 to move arms I4! and I43 closer to each other. In this manner, the type wheel is permitted to move one-half step in the normal direction of movement of the cylinder I25 to condition upper case characters for printing.

On the other hand, in response to an unshift code combination, that particular drop bar H4 having depending arm 228 will be selected whereby link 23! will be actuated leftwardly to bring latch member 233 into operative engagement with arm 231, so that upon the subsequent reciprocation of arm 233, lever 231 will be engaged and shift control lever 24I will be rocked counterclockwise causing, throughpin 243, sleeve 245 to be moved leftwardly, whereby arm I42 will coact with cam surfaces 241 and 248 to spread arms I4! and I43 apart, against the action of spring I41), sufiiciently to change the angular relationship between stop arms I22 and type wheel I26 one-half step, thereby conditioning the lower case characters for printing.

Modification In Fig. 11 is shown a modified form of selector mechanism wherein the stop arms are provided with forked ends, each tine or prong having two steps or shoulders, and the drop bars are shiftable collectively at their abutment ends to cooperate with one or the other series of tines. Having reference to Fig. 11, the code bars 2H and 212 and the comb bar 213 (which is not provided with code notches are shiftable in code manner similar to the series of code bars H31 (Fig. 2) of the principal form of the invention, through the instrumentality of the T-levers I05 and associated members 94, 99, etc., of the selector mechanism shown in Fig. 4. The code bars 211 and 212 and the comb bar 213, besides being pivotaly articulated through notches 290 to T-levers analogous to T-levers I35, are slidably mounted on studs 215, are adapted to be set permutably in accordance with the received code combinations of impulses by the selector mechanism described in connection with the pre-' ferred embodiment, and are retained in their set positions by the coaction of a spring actuated detent member (not shown in Fig. 11, but analogous to detent member III shown in Fig. 4) with detent notches 211.

Cooperating with the code bars 2H and 212, and comb bar 213 is a plurality of selector drop bars or abutment members 2 58. In the arrangement shown, there are eight members 278, which are not only mounted pivotally on shaft 2W, but are, at the same time, swivelly movable thereon. The ends 279 of arms 28% of the selector members 278 provide abutments for a series of stop arms 23! helically arranged around and afixed to a cylinder 282. Each stop arm 28! is provided with a forked end having two tines or prongs 253 and 284, and each tine terminates in a pair of stepped shoulders 285 and 236, one or the other of which impinges against a selected member 2m, as will presently appear. Each of the arms 2st has a vertically extending projection 28'! which cooperates with the comb bar 213.

The three code bars 212, when operated permutably, effect the selection of one of the drop bars 218. The bottom or comb bar 2'33, when shiftedin response to one impulse of the received code combinations, acts, due to it's articulation through projections 28! to drop bars 218, to swivel the drop bars 218 on shaft 2'18 and thus shift collectively the ends 2'59 of arms 2M to one or the other series of tines 283 or 284, as indicated in Fig. 11 by the solid line and dotted line positions; The top code bar 2', like code bar I20 of the principal embodiment, has its wards or projections only about one-half as high as the wards of the code bars 2'12, and for the same purpose; namely, of determining with which shoulder 285 or 288 the end 219 of the selected drop bar 218 will abut. Summing up, code bars 212 determine which drop bar 2?8 Will be selected or operated, comb bar 233 determines which of the pair of tines the selected drop bar will cooperate with, and the top code bar 21! determines which shoulder 235M 286 shall abut the end 219 of the selected drop bar.

The shoulders 285 and 286 are angularly arranged in a manner similar to shoulders E24 and 230, shown in Fig. 8. The cylinder 282 also has afiixed thereto a star wheel 289, similar to the arrangement shown in connection with the principal embodiment of the invention, which star Wheel has cooperating therewith an anti-spin lever 29! (similar to member 156) associated with the transfer bail 288 (similar to transfer bail I48 of the preferred form of the invention).

The operation of the selector mechanism in accordance with Fig. 11 is similar in many respects to the selector mechanism shown in the principal form of the invention in that the signal impulses representing the character are applied to the selector magnet 83 (Fig. 4), and the selector cam barrel 5| is released for operation to eifect, through the cooperation of selector lever 19 and selector members 94, the selective positionment of T-levers similar to T-levers I95. These T-levers are articulated to the code bars 21! and 212 of the comb bar 273 in a manner similar to that shown between T-levers we and code bars H37 in Fig. 4. In timed relation with the rotation of the selector cam barrel 5!, the transfer bail 288 is operated (in a manner similar to transfer bail I48) to permit the transference of the selection from the T-levers to the code and comb bars. As pointed out in connection with the preferred form of the invention, while the transfer bail 283 is thus operated to raise the drop bars 218 out of engagement withthe code bars 2' and 2.?2 (the comb bar 213 not being provided with code notches), there-- upon lifting end 279 out of abutting relation with the stop arms 28!,

the path of the oncoming tooth of the star Wheel 289. Then, when the transfer bail 288 is returned to its clockwise position, lever 29! is withdrawn from engagement with the star wheel 289 to permit the rotation of cylinder H32 until one of the shoulders 285 or 286 ofthe stop arms 28! abuts the end 279 of the newly selected drop bar 273. After the type wheel has been stopped under the control of cylinder the printing operation is effected in a manner similar to that described in the principal embodiment.

The invention herein described may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present disclosure is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims therefore intended to be embraced therein.

What is claimed is:

1. In a printing telegraph receiver, a rotatable type wheel provided with a plurality of characters, a member having a series of arms less in number than the number of characters on said type wheel for controlling the rotation thereof, stop means cooperable with said arms for controlling said member, and a permutation code selector mechanism for controlling said stop means.

2. In a selector, a rotatable shaft, arms having a plurality of abutting surfaces positioned on said shaft, and a permutation code selector mechanism cooperable with said surfaces to determine the stop position of said shaft.

3. In a printing telegraph receiver, a startstop type Wheel, a member having a helical series of arms, each arm provided with a plurality of abutting surfaces, for controlling the rotation of said type wheel, a stop element individual to each arm and cooperable with said abutting surfaces, a permutation code selector mechanism for controlling said stop elements, and therethrough the position of said type wheel, and a printing mechanism effective thereafter to print from said type wheel.

4. In a selector, a rotatable shaft arrestable in any one of a plurality of character positions, a cylinder carried by said shaft having projections thereon less in number than the available number of character positions, and abutment members corresponding in number to the number of said projections oooperable with said projections for determining the stop position of said shaft.

5. In a selector, a rotatable shaft arrestable in any one of a plurality of character positions, a cylinder carried by said shaft having projections thereon less in number than the number of character stop positions, mechanism for controlling the rotation of said cylinder, and a permutation code selectcr mechanism for controlling said mechanism to determine the stop position of said cylinder and shaft.

6. In a printing telegraph receiver, a type Wheel, a member for controlling the rotation thereof, arms having a plurality of abutting sur faces arranged around said member, and a permutation code selector mechanism oooperable with said surfaces to determine the stop position of said member.

7. In a printing telegraph receiver, a type the cylinder 232 is prevetedwheel, a rotatable shaft therefor arrestable in from spinning by the moving of lever 29! intoany one of a plurality of character positions, a

cylinder carried by said shaft having projections thereon less in number than the available number of character stopping positions, and abutlment members corresponding in number to the number of said projections cooperable with said projections for determining the stop position of said shaft.

8. In a printing telegraph receiver, a type "wheel, a member for controlling the rotation thereof, arms having a plurality of abutting surfaces arranged around said member, a permutation code selector mechanism comprising selectable abutment members cooperable with said surfaces to determine the stop position of said member, and means to alter the operative relationship between said arms and said abutment members.

9. In a recorder, a rotatable shaft, arms having a plurality of abutting surfaces arranged around said shaft, a permutation code selector mechanism comprising selectable abutment members cooperable with said surfaces to determine the stop position of said shaft, and means to alter the operative relationship between said arms and said abutment members.

10. In a printing telegraph receiver, a shaft constantly tending to rotate, arms arranged around said shaft, a permutation code selector mechanism comprising selectable abutment members cooperable with said arms to determine the stop position of said shaft, an intercepting member, and solely mechanical means to render said abutment members and said intercepting imember alternately engageable with said arms to prevent the spinning of said shaft during the period of reselection of said abutment members.

11. In a printing telegraph receiver, a shaft constantly tending to rotate, arms arranged around said shaft, a permutation code selector mechanism comprising selectable abutment members cooperable with said arms to determine the stop position of said shaft, means operable on said abutment members to enable the reselection thereof, a star wheel fixed to said shaft, and means controlled by said means and co operable with said star wheel to prevent the spinning of said shaft during the period of reselection of said abutment members.

12. In a selector, a rotatable shaft, arms arranged around said shaft, a permutation code selector mechanism comprising selectable abut- -ment members cooperable with said arms to determine the stop position of said shaft, means to facilitate the reselection of said abutment members, and anti-spin means controlled by said means and effective during the period of reselection to control said shaft.

13. In a printing telegraph receiver, a type wheel, a member for controlling the rotation thereof, arms arranged around said member, a permutation code selector mechanism comprising elements cooperable with said arms to determine the stop position of said member, means acting on said elements periodically, and anti spin means acted upon by said means alternately with respect to said elements and effective during the period of reselection of said elements to control said member.

14. In a selector, a rotatable shaft arrestable in any one of a plurality of character positions, a cylinder carried by said shaft having projections thereon, a permutation mechanism comprising elements cooperable with said projections to .determinethe stop position of said cylinder, means acting on said elements periodically,

and anti-spin means acted upon by said means alternately with respect to said. elements and effective during the period of reselection of said elements to control said cylinder.

15. In a selector, a plurality of code bars, means controlled by signaling impulses for positioning said code bars, a plurality of selectable members, means for determining the selection of certain of said selectable members solely through the positioning of certain of said code bars, and means whereby other of said selectable members are conditioned for selective operation independently of the positioning of said certain code bars.

16. In a selectona rotatable shaft arrestable in any one of a plurality of character positions, a cylinder carried by said shaft having projections thereon less in number than the available number of character stopping positions, abutment members corresponding in number to the number of said projections, a plurality of code bars, and means controlled by signaling impulses for positioning said code bars to effect the selec tive operation of said abutment members for cooperation with said projections for determin-- ing the stop position of said shaft.

17. In a selector, a rotatable shaft, arms having a plurality of abutting surfaces positioned on said shaft, a permutation code selector mechanism comprising a plurality of code bars, means controlled by signaling impulses for positioning said code bars, a plurality of selectable members selected upon the positioning of certain ofsaid code bars independently of the position of the remaining code bars to determine certain stop positions of said shaft, and other selectable instrumentalitiesconditioned upon the positioning of said, remaining code bars to determine other stop positions of said shaft.

18. In a printing telegraph receiver, a rotatable type wheel provided With a plurality of characters, a member having a series of arms each ar ranged with a plurality of shoulders for controlling the rotation of said type wheel, stop means cooperable with said shoulders for controlling said member, a plurality of code bars, and means controlled by signaling impulses for positioning said code bars to determine the cooperative relationship between said stop means and said shoulders.

19. In a printing telegraph receiver, a rotatable type wheel, a member having a helical series of arms each arranged with a plurality of shoulders for controlling the rotation thereof, a stop element individual to each arm and cooperable with said shoulders, a plurality of code bars, and means controlled by signaling impulses for positioning said code bars to determine the cooperative re,- lationship between said stop elements and said shoulders.

20. In a printing telegraph receiver, a type wheel, a member for controlling the rotation thereof, arms having a plurality of abutting surfaces arranged around said member, a plurality of code bars, means controlled by signaling impulses for positioning said code bars, a plurality of abutment members, means for determining the selection of certain of said abutment members solely through the positioning of certain of said code bars tocooperate with said surfaces in acertain manner, and means whereby other of said abutment members are conditioned for selective operation independently of the positioning of said certain code bars to cooperate with said surfaces in a different manner. l

21. In a recorder, a rotatable shaft, arms having forked ends arranged around said shaft, a selector mechanism comprising selectable abutment members cooperable with the forked ends to determine the stop position of said shaft, and means to swivel said abutment members into operative relationship with corresponding series of ends of said arms.

22. In a printing telegraph receiver, a shaft constantly tending to rotate, forked arms having a plurality of tines arranged around said shaft, each tine being provided with a plurality of stepped abutting surfaces, a selector mechanism comprising selectable abutment members cooperable with said surfaces to determine the stop position of said member, means to change the operative relationship between said abutment members and said surfaces, and means to change the operative relationship between said abutments and said tines.

23. In a printing telegraph receiver, a type Wheel, a rotatable shaft therefor arrestable in any one of. a plurality of character positions, a cylinder carried by said shaft provided with projections less in number than the available number of character stopping positions, and abutment members less in number than the number of said projections cooperable with said projections for determining the stop position of said shaft.

24. In a printing telegraph receiver, a type wheel, a rotatable shaft therefor arrestable in any one of a plurality of character positions, a cylinder carried by said shaft provided with projections less in number than the available number of character stopping positions, abutment members less in number than the number of said projections cooperable with said projections for determining the stop position of said shaft, means for controlling the operative relationship between said abutments and said projections in a certain manner, and means for controlling the operative relationship between said abutments and said projections in a different manner.

25. In a printing telegraph receiver, a type wheel, a member for controlling the rotation thereof, arms having a plurality of abutting surfaces arranged around said member, selecting means comprising a plurality of selectable abutment members cooperable with said surfaces to determine the stop position of said member, means for controlling the operative relationship between said abutment members and said surfaces in a certain manner, and means for controlling the operative relationship between said abutments and said surfaces in a different manner.

26. In a printing telegraph receiver, a shaft, a type wheel on said shaft, means also on said shaft for determining its stop position for printing from said type wheel, a plurality of code bars mounted parallel and in juxtaposition to said shaft, means responsive to signaling impulses for setting said code bars, and means intermediate said code bars and the means on said shaft and selective through the setting thereof and cooperating with the means on said shaft for stopping said shaft and said type wheel in the desired printing position.

27. In a selector, a plurality of code bars, a plurality of selectable elements less in number than the letters of the alphabet, means responsive to signaling impulses for setting said code bars to determine the selection of said elements, means for precluding the operation of the selected element for a predetermined period of a cycle of operation, a plurality of type elements, and means operated through the selection and operation of. a selectable element for determining the type ele ment to be operated.

28. In a recorder, a rotatable shaft, arms having forked ends arranged on the periphery of said shaft, a selector mechanism comprising selectable members cooperab-le with the forked ends of said arms to determine the stop position of said shaft, and means to swivel said members into operative relationship with corresponding series of ends of said arms.

HOWARD L. KRUM. 

